Calorimetry ONE SHOT Numericals

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CALORIMETRY:    • CALORIMETRY  

Unit A part 01:
   • ICSE PHYSICS Class10 Chapter-11 Calor...  
Unit A part 02:   • ICSE PHYSICS Class10 Chapter-11 Calor...  
Unit A Part 03:
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Unit A Part 04:
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Unit A Part 05:
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Unit A NUMERICALS:    • ICSE PHYSICS||Class10||Calorimetry#06...  
Unit B Part 01:
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Unit B Part 02:
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Unit B NUMERICALS:    • ICSE PHYSICS ||Class10|| Calorimetry-...  
Unit B NUMERICALS Part 02:    • ICSE PHYSICS ||Class10|| Calorimetry-...  


Temperature is a parameter which tells the thermal state of a body (i.e., the degree of hotness or coldness of body). It determines the direction of flow of heat when two bodies at different temperatures are pla


The specific heat capacity of a substance is the amount of heat energy required to raise the temperature of unit mass of that substance through 1°C

A liquid which has the highest specific heat capacity is water.
The factors on which the heat energy liberated by a body on cooling depends are:

Mass of the body
Temperature of the body.
Three factors on which the heat energy absorbed by a body depends are:

Mass of the body — Heat energy absorbed by a body is directly proportional to the mass of the body i.e., Q ∝ m.
Increase in temperature of the body — Heat energy absorbed is directly proportional to the rise in temperature i.e., Q ∝ △t.
The material of the body — Heat energy absorbed by a body depends on the substance of the object which is expressed in terms of it's specific heat capacity c i.e., Q ∝ c.

PRINCIPLE OF CALORIMETRY:
Heat energy lost by the hot body = Heat energy gained by the cold body. This is called the principle of method of mixture.
The other name given to it is the principle of calorimetry.
This principle is based on the law of conservation of energy.

Why do the farmers fill their fields with water on a cold winter night?
On a cold winter night, if the atmospheric temperature falls below 0° C, water in the fine capillaries of plants will freeze, so the veins will burst due to the increase in volume of water on freezing. As a result, plants will die and the crop will get destroyed. In order to save crop on such cold nights, farmers fill their fields with water because water has a high specific heat capacity, so it does not allow the temperature in the surrounding area of plants to fall up to 0° C.

Water is used in hot water bottles for fomentation. Give reason.
Hot water bottles are used for fomentation because water does not cool quickly due to it's high specific heat capacity, so a hot water bottle provides more heat energy for fomentation over a longer period. Hence, water is used in hot water bottles for

(a) The process of change from one state to another at a constant temperature is called the change of phase.
(b) No, there is no change in temperature during the change of phase.
(c) Yes, the substance absorb or liberates heat during the change of phase. The heat is absorbed during melting and it is liberated during freezing at a constant temperature.
(d) The name given to the energy absorbed during a phase change is latent heat.

(i) When a substance on heating undergoes a rise in it's temperature then average kinetic energy of molecules increases.
(ii) When a substance on heating undergoes a change in it's phase without change in it's temperature then average potential energy of molecules increases.

State the effect of presence of impurity on the melting point of ice. Give one use of it?
The melting point of a substance decreases by the presence of impurities in it. The melting point of ice decreases from 0 ° C to -22 ° C on mixing salt to it in proper proportion. This fact is utilized in making the freezing mixture by adding salt to ice. The freezing mixture is used in preparing 'kulfis

The melting point of the substances which contract on melting (like ice) decreases by the increase in pressure. For example, the melting point of ice decreases by 0.0072°C for every one atmosphere rise in pressure.

The boiling point of water increases by addition of salt to it. If common salt is added to water, it boils at a temperature higher than 100° C.

Water boils at 120° C in a pressure cooker. Explain the reason.
The boiling point of liquid increases with the increase in pressure and decreases with the decrease in pressure. The boiling point of pure water at one atmospheric pressure is 100° C.

In a pressure cooker, steam is not allowed to escape out. The vapour pressure on water inside the cooker becomes nearly 1.75 times the atmospheric pressure, so water boils in it at about 120° C to 125° C due to increased pressure.